edu.scripps.fl.pubchem.app.util.GroupingIterator.java Source code

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Here is the source code for edu.scripps.fl.pubchem.app.util.GroupingIterator.java

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/*
 * Copyright 2010 The Scripps Research Institute
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package edu.scripps.fl.pubchem.app.util;

import java.lang.reflect.Array;
import java.util.Iterator;

import org.apache.commons.beanutils.ConvertUtils;

public class GroupingIterator implements Iterator {
    private Iterator iterator;
    private int groupSize = 3;
    private Class clazz;
    private Object array;

    public GroupingIterator(Iterator iterator, Class clazz, int groupSize) {
        this.iterator = iterator;
        this.groupSize = groupSize;
        this.clazz = clazz;
    }

    public boolean hasNext() {
        array = Array.newInstance(clazz, groupSize);
        int ii = 0;
        for (ii = 0; ii < groupSize; ii++)
            if (iterator.hasNext()) {
                Object obj = iterator.next();
                obj = ConvertUtils.convert(obj, clazz);
                Array.set(array, ii, obj);
            } else
                break;
        if (ii < groupSize) {
            Object dest = Array.newInstance(clazz, ii);
            System.arraycopy(array, 0, dest, 0, ii);
            array = dest;
        }
        return ii > 0;
    }

    public Object next() {
        return array;
    }

    public void remove() {
    }
}